Kernel: Begin implementing UNIX domain sockets.

Kernel/LocalSocket.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <Kernel/Socket.h>
+#include <Kernel/DoubleBuffer.h>
+
+class LocalSocket final : public Socket {
+public:
+    static RetainPtr<LocalSocket> create(int type);
+    virtual ~LocalSocket() override;
+
+private:
+    explicit LocalSocket(int type);
+
+    DoubleBuffer m_for_client;
+    DoubleBuffer m_for_server;
+};
+